* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Helvetica Neue', Arial, sans-serif;
}

body {
    background: linear-gradient(135deg, #f5f7fa 0%, #e4e8f0 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 30px;
    color: #333;
}

.BOX-box {
    width: 100%;
    max-width: 850px;
    margin: 0 auto;
}

.box {
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
    overflow: hidden;
    transition: transform 0.3s ease;
    position: relative;
}

.box:hover {
    transform: translateY(-5px);
}

.box-icon {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 25px;
    background: #fff;
    border-bottom: 1px solid #eaeaea;
    position: sticky;
    top: 0;
    z-index: 10;
}

.box-icon-left,
.box-icon-right {
    display: flex;
    align-items: center;
    gap: 18px;
}

.font-size-controls {
    display: flex;
    align-items: center;
    gap: 10px;
    background: #f8f9fc;
    border-radius: 6px;
    padding: 5px 8px;
}

.controls-icon {
    background: transparent;
    border: 1px solid #e0e0e0;
    width: 36px;
    height: 36px;
    border-radius: 6px;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    color: #555;
    transition: all 0.25s;
}

.controls-icon:hover {
    background: #f0f5ff;
    color: #2a6eff;
    border-color: #b8d0ff;
}

.controls-text {
    font-size: 17px;
    font-weight: 500;
    min-width: 24px;
    text-align: center;
    color: #444;
}

.english-study {
    padding: 45px 35px 25px;
}

.english-title {
    font-size: 32px;
    color: #1a1a1a;
    margin-bottom: 25px;
    font-weight: 650;
    line-height: 1.35;
    letter-spacing: -0.2px;
}

.meta-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
    margin-bottom: 30px;
}

.english-title-icon {
    display: flex;
    align-items: center;
    gap: 15px;
    color: #666;
    font-size: 14.5px;
    flex-wrap: wrap;
}

.title-icon-left {
    background: #eef5ff;
    color: #2a6eff;
    padding: 6px 12px;
    border-radius: 4px;
    font-weight: 500;
    font-size: 13.5px;
}

.title-icon-middle {
    display: flex;
    align-items: center;
    gap: 5px;
    color: #666;
}

.title-icon-right {
    background: #f0fdf5;
    color: #0daa5e;
    padding: 6px 12px;
    border-radius: 4px;
    font-weight: 500;
    font-size: 13.5px;
}

.english-math {
    background: #f9fafc;
    border-radius: 18px;
    padding: 8px 15px;
    font-size: 14px;
}

.text-text {
    color: #666;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 5px;
}

.progress-container {
    display: none;
}

.english-article {
    padding: 0 15px 15px;
    font-size: 18px;
    line-height: 1.85;
    color: #444;
    margin-top: 10px;
}

.paragraph {
    margin-bottom: 28px;
    text-align: justify;
    position: relative;
    padding-left: 15px;
}

.paragraph:before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.5em;
    height: calc(100% - 0.7em);
    width: 3px;
    background: #e6f0ff;
    border-radius: 3px;
}

#translation {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s cubic-bezier(0.23, 1, 0.32, 1);
}

#translation.translate-visible {
    max-height: 5000px;
}

.translate-box {
    padding: 30px;
    background: #fafcff;
    border-top: 1px solid #eaeff8;
}

.translate-title {
    font-size: 22px;
    color: #222;
    margin-bottom: 22px;
    font-weight: 600;
    padding-bottom: 10px;
    border-bottom: 2px solid #eef5ff;
}

.translate-text .paragraph {
    font-size: 16.5px;
    color: #555;
}

@media (max-width: 768px) {
    body {
        padding: 15px;
    }
    .english-title {
        font-size: 26px;
    }
    .box-icon {
        padding: 15px;
    }
    .english-study {
        padding: 35px 20px 20px;
    }
    .meta-container {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    .english-article {
        font-size: 16.8px;
    }
    .english-math {
        align-self: flex-start;
    }
}